At this point you should be able to ping an iSCSI storage node from the server console

Don't make the same mistake I did... remember to give the server node access permissions within your SAN management interface so that it can discover the Target IQN. To find the IQN of the node type simply open the server node properties. On the General tab it is listed at the bottom. Change it to a desired IQN.

Click Storage and select iSCSI

Type in the IP of the Storage server target host

Click discover IQNs then discover LUNs. Click Finish. Note that you will want to ensure that you have exported your VI server prior to connecting to any existing VI LUNs as it will format the disk for XenServer use.

At this point I went on to import the converted VI server onto the disk. Note that initial attempts to import a 19.99GB export onto a 20GB disk failed saying that their wasn't enough space. To get around this I edited the volume to have an additional .5GB. Less than this would have likely been sufficient. I then followed the import steps from Virtual Iron > Citrix XenServer Conversion to successfully import the VM.

You can self define to some extent each hosts IQN. You can find this setting in the GUI under properties for each node. It's under the general tab at the bottom. Each node of course has to be a unique IQN.